Padlock



UNITED sTATEs PATENT oEEioE.

THOMAS YSLAIGHT, OFNEWARK, NEW' JERSEY.

rADLocK'.

Specification of Letters .Patent No. 12,186, dated January 2,1855.

To all whom t may concern:

Be it known that I, THOMAS ,SLAIGHT, of Newark, in the county of Essexand State of New Jersey, have invented a new and ImprovedSpring-Padlock; and I do hereby declare that the following is a full,clear, and exact description of the same, reference being had to theannexed drawings, making a part of this specification, in which- Figure1, is a front View of my improved padlock, the casing nearest the eyebeing removed in order to show the interior. In this view the end oftheshackle is within the casing, and the lock is in a locked state. Fig. 2,is the same view as Fig. 1, with the exceptionthat the end of theshackle is out of the casing, and the lock in an unlocked state.

Similar letters of reference indicate corresponding parts in thetwofigures.

This invention relates to a' new and improved spring padlock, andconsists 1st, in

the employment or use of a dog so constructed and arranged that the' endof the shackle when pressed or forced into the casing will act upon the4dog .and throw it into a recess or notch in the shackle without theintervention or aid of a spring; 2nd, my invention consists in thecombination of the dog above mentioned, guard bar, and tumblers,arranged as will be hereafter fully shown and described, for the purposeof preventing the lock from being picked.

To enable others skilled in the art to fully understand and construct myinvention I will proceed to describe it.

A represents the casing of the lock constructed in the usual manner, andB is the shackle of the well known form one' end of which isV secured bya bolt (a) to the upper end of the casing,the shackle turning looselythereon as usual. The opposite end of the shackle has a recess or notch(b) cut in itv which passes in and out of the casing through a'slo't (c)in its upper end.

C is a dog placed within the casing A and working upon a pivot (d). Thisdog has a recess (e) cut in it a short distance above the pivot (d) thelower edge or side of the recess projecting outward beyond the upperedge or side, the lower edge or side of said recess being directlyunderneath the slot (c) l the casing A.YThis guard bar works upon Y apivot "(9)."and its `upper end/has a curved recess (h) cut in itdirectly below which there is attached a spring the lower end of whichbears against the lower end of the dog C. To the guard bar D at a pointabout equidistantv'between its lower end and the pivot (g) there isattached a stud E, represents a series 'of tumblers, one end of whichwork upon a pivot Us), the edges of these tumblers at their oppositeends have slots (l) cut in them, one in each, at varying distances fromthe sides of the tumblers. The tumblers are provided with springs (a) asusual.

When the lock is in a locked state, as A shown in Fig. 1, and it isdesigned to unlock it, the key see Fig. 2, or rather end of the dog Cand the upper end of the dog is thrown back by the action of the springinto the curved recess (It) at the upper end of the guard bar theprojection (f) on the shackle being freed from the recess (e) in thedog, see Fig. 2.

To lock the lock all that is required is to press the shackle into thecase, and the lower end of the shackle will bear upon the lower edge orsideof the recess (e) and throw the upper end of the dog in the recessor notch (b) the projection (f) on the shackle passing into the recess(e) and the upper edge of the guard bar D passing down behind the upperend of the dog, see Fig. 1.

By the above invention it will be seen that no spring is required tothrow the dog into the shackle, even the spring (i) of the guard bar isnot essential, or it may be dispensed with without affecting the generalworking of the parts. The great objection to spring padlocks hithertohas been the failing of the spring which has always been employed tothrow the dog in the shackle.

I do not claim, the tumblers E separately, nor the guard bar, for theyhave been. previously used, but

What I do claim as new, and desire to secure by Letters Patent, is-

1. The employment or use of a dog C constructed as herein shown or in anequivalent way so that the pressure of the shackle upon it, when the endof said shackle is forced into the case, will throw the dog into the l5recess or notch in the shackle without the intervention or aid of aspring or any other device.

THOMAS SLAIGHT.

Witnesses W. WHITNEY, HERVEY PARK.

